diff --git a/README.md b/README.md
index b4a59d8..92bee85 100644
--- a/README.md
+++ b/README.md
@@ -27,9 +27,11 @@ GCC compiler for AmigaOS 3.x
 
 #### Installed in your system
 
- * GNU gcc 4.x
+ * GNU autoconf
  * GNU flex 2.5.x
+ * GNU gcc 4.x
  * GNU make 3.x
+ * GNU texinfo 4.x
  * lha
  * perl 5.10
 
@@ -69,7 +71,8 @@ As listed in `bootstrap.conf` file:
 Following platforms were tested:
 
  * Cygwin 1.7.18 (gcc 4.5.3)
- * Ubuntu 10.04 32-bit (gcc 4.4.3)
+ * Ubuntu 12.04 LTS 32-bit (gcc 4.6.3)
+ * Ubuntu 12.04 LTS 64-bit (gcc 4.6.3) *requires gcc-multilib*
  * MacOS X 10.7.5 (MacPorts - gcc 4.7.3)
  
 But I do as much as possible to make the toolchain portable among Un*x-like environments.
diff --git a/bootstrap.sh b/bootstrap.sh
index acbbcf6..ef6dba6 100755
--- a/bootstrap.sh
+++ b/bootstrap.sh
@@ -512,7 +512,8 @@ function build {
     # thinking that they're being compiled on IA-32 architecture.
     CC="${CC} ${ARCH:-}"
     CXX="${CXX} ${ARCH:-}"
-    GCC_CONFIGURE_OPTS+=("--host=i686-linux-gnu")
+    GCC_CONFIGURE_OPTS+=("--host=i686-linux-gnu" \
+                         "--build=i686-linux-gnu")
   else
     # GCC 4.x requires some extra dependencies to be supplied.
     GCC_CONFIGURE_OPTS+=("--with-gmp=${HOST_DIR}" \